Restructuring of the magnetic field in the near region of the nighttime magnetosphere during the preliminary phase of a substorm.

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Scientific paper

The author studies the development of the nightside pressure anisotropy of the inner magnetosphere within the framework of the adiabatic approximation. He shows that a gradual decrease in the Bz component in the equatorial region is a necessary condition for the development of extended structure in the magnetic field, including the thin current sheet that characterizes the end of the onset phase in substorms. During the initial phases in the evolution of the magnetic structure, the evolution is mainly driven by external effects such as an increase in the magnetic flux in the tail region; later, however, the evolution is also maintained by positive feedback between the field configuration and the plasma anisotropy. Other reasons for the development of plasma anisotropy associated with azimuthal asymmetry in the magnetosphere are also discussed.

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